Move store-buffer to heap and remove some unnecessary includes.

src/store-buffer.h

-// Copyright 2011 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef V8_STORE_BUFFER_H_
-#define V8_STORE_BUFFER_H_
-
-#include "src/allocation.h"
-#include "src/base/logging.h"
-#include "src/base/platform/platform.h"
-#include "src/globals.h"
-
-namespace v8 {
-namespace internal {
-
-class Page;
-class PagedSpace;
-class StoreBuffer;
-
-typedef void (*ObjectSlotCallback)(HeapObject** from, HeapObject* to);
-
-typedef void (StoreBuffer::*RegionCallback)(Address start,
-                                            Address end,
-                                            ObjectSlotCallback slot_callback,
-                                            bool clear_maps);
-
-// Used to implement the write barrier by collecting addresses of pointers
-// between spaces.
-class StoreBuffer {
- public:
-  explicit StoreBuffer(Heap* heap);
-
-  static void StoreBufferOverflow(Isolate* isolate);
-
-  inline Address TopAddress();
-
-  void SetUp();
-  void TearDown();
-
-  // This is used by the mutator to enter addresses into the store buffer.
-  inline void Mark(Address addr);
-
-  // This is used by the heap traversal to enter the addresses into the store
-  // buffer that should still be in the store buffer after GC.  It enters
-  // addresses directly into the old buffer because the GC starts by wiping the
-  // old buffer and thereafter only visits each cell once so there is no need
-  // to attempt to remove any dupes.  During the first part of a GC we
-  // are using the store buffer to access the old spaces and at the same time
-  // we are rebuilding the store buffer using this function.  There is, however
-  // no issue of overwriting the buffer we are iterating over, because this
-  // stage of the scavenge can only reduce the number of addresses in the store
-  // buffer (some objects are promoted so pointers to them do not need to be in
-  // the store buffer).  The later parts of the GC scan the pages that are
-  // exempt from the store buffer and process the promotion queue.  These steps
-  // can overflow this buffer.  We check for this and on overflow we call the
-  // callback set up with the StoreBufferRebuildScope object.
-  inline void EnterDirectlyIntoStoreBuffer(Address addr);
-
-  // Iterates over all pointers that go from old space to new space.  It will
-  // delete the store buffer as it starts so the callback should reenter
-  // surviving old-to-new pointers into the store buffer to rebuild it.
-  void IteratePointersToNewSpace(ObjectSlotCallback callback);
-
-  // Same as IteratePointersToNewSpace but additonally clears maps in objects
-  // referenced from the store buffer that do not contain a forwarding pointer.
-  void IteratePointersToNewSpaceAndClearMaps(ObjectSlotCallback callback);
-
-  static const int kStoreBufferOverflowBit = 1 << (14 + kPointerSizeLog2);
-  static const int kStoreBufferSize = kStoreBufferOverflowBit;
-  static const int kStoreBufferLength = kStoreBufferSize / sizeof(Address);
-  static const int kOldStoreBufferLength = kStoreBufferLength * 16;
-  static const int kHashSetLengthLog2 = 12;
-  static const int kHashSetLength = 1 << kHashSetLengthLog2;
-
-  void Compact();
-
-  void GCPrologue();
-  void GCEpilogue();
-
-  Object*** Limit() { return reinterpret_cast<Object***>(old_limit_); }
-  Object*** Start() { return reinterpret_cast<Object***>(old_start_); }
-  Object*** Top() { return reinterpret_cast<Object***>(old_top_); }
-  void SetTop(Object*** top) {
-    DCHECK(top >= Start());
-    DCHECK(top <= Limit());
-    old_top_ = reinterpret_cast<Address*>(top);
-  }
-
-  bool old_buffer_is_sorted() { return old_buffer_is_sorted_; }
-  bool old_buffer_is_filtered() { return old_buffer_is_filtered_; }
-
-  // Goes through the store buffer removing pointers to things that have
-  // been promoted.  Rebuilds the store buffer completely if it overflowed.
-  void SortUniq();
-
-  void EnsureSpace(intptr_t space_needed);
-  void Verify();
-
-  bool PrepareForIteration();
-
-#ifdef DEBUG
-  void Clean();
-  // Slow, for asserts only.
-  bool CellIsInStoreBuffer(Address cell);
-#endif
-
-  void Filter(int flag);
-
- private:
-  Heap* heap_;
-
-  // The store buffer is divided up into a new buffer that is constantly being
-  // filled by mutator activity and an old buffer that is filled with the data
-  // from the new buffer after compression.
-  Address* start_;
-  Address* limit_;
-
-  Address* old_start_;
-  Address* old_limit_;
-  Address* old_top_;
-  Address* old_reserved_limit_;
-  base::VirtualMemory* old_virtual_memory_;
-
-  bool old_buffer_is_sorted_;
-  bool old_buffer_is_filtered_;
-  bool during_gc_;
-  // The garbage collector iterates over many pointers to new space that are not
-  // handled by the store buffer.  This flag indicates whether the pointers
-  // found by the callbacks should be added to the store buffer or not.
-  bool store_buffer_rebuilding_enabled_;
-  StoreBufferCallback callback_;
-  bool may_move_store_buffer_entries_;
-
-  base::VirtualMemory* virtual_memory_;
-
-  // Two hash sets used for filtering.
-  // If address is in the hash set then it is guaranteed to be in the
-  // old part of the store buffer.
-  uintptr_t* hash_set_1_;
-  uintptr_t* hash_set_2_;
-  bool hash_sets_are_empty_;
-
-  void ClearFilteringHashSets();
-
-  bool SpaceAvailable(intptr_t space_needed);
-  void Uniq();
-  void ExemptPopularPages(int prime_sample_step, int threshold);
-
-  // Set the map field of the object to NULL if contains a map.
-  inline void ClearDeadObject(HeapObject *object);
-
-  void IteratePointersToNewSpace(ObjectSlotCallback callback, bool clear_maps);
-
-  void FindPointersToNewSpaceInRegion(Address start,
-                                      Address end,
-                                      ObjectSlotCallback slot_callback,
-                                      bool clear_maps);
-
-  // For each region of pointers on a page in use from an old space call
-  // visit_pointer_region callback.
-  // If either visit_pointer_region or callback can cause an allocation
-  // in old space and changes in allocation watermark then
-  // can_preallocate_during_iteration should be set to true.
-  void IteratePointersOnPage(
-      PagedSpace* space,
-      Page* page,
-      RegionCallback region_callback,
-      ObjectSlotCallback slot_callback);
-
-  void IteratePointersInStoreBuffer(ObjectSlotCallback slot_callback,
-                                    bool clear_maps);
-
-#ifdef VERIFY_HEAP
-  void VerifyPointers(LargeObjectSpace* space);
-#endif
-
-  friend class StoreBufferRebuildScope;
-  friend class DontMoveStoreBufferEntriesScope;
-};
-
-
-class StoreBufferRebuildScope {
- public:
-  explicit StoreBufferRebuildScope(Heap* heap,
-                                   StoreBuffer* store_buffer,
-                                   StoreBufferCallback callback)
-      : store_buffer_(store_buffer),
-        stored_state_(store_buffer->store_buffer_rebuilding_enabled_),
-        stored_callback_(store_buffer->callback_) {
-    store_buffer_->store_buffer_rebuilding_enabled_ = true;
-    store_buffer_->callback_ = callback;
-    (*callback)(heap, NULL, kStoreBufferStartScanningPagesEvent);
-  }
-
-  ~StoreBufferRebuildScope() {
-    store_buffer_->callback_ = stored_callback_;
-    store_buffer_->store_buffer_rebuilding_enabled_ = stored_state_;
-  }
-
- private:
-  StoreBuffer* store_buffer_;
-  bool stored_state_;
-  StoreBufferCallback stored_callback_;
-};
-
-
-class DontMoveStoreBufferEntriesScope {
- public:
-  explicit DontMoveStoreBufferEntriesScope(StoreBuffer* store_buffer)
-      : store_buffer_(store_buffer),
-        stored_state_(store_buffer->may_move_store_buffer_entries_) {
-    store_buffer_->may_move_store_buffer_entries_ = false;
-  }
-
-  ~DontMoveStoreBufferEntriesScope() {
-    store_buffer_->may_move_store_buffer_entries_ = stored_state_;
-  }
-
- private:
-  StoreBuffer* store_buffer_;
-  bool stored_state_;
-};
-
-} }  // namespace v8::internal
-
-#endif  // V8_STORE_BUFFER_H_